What Is Lactobacillus/Licorice Root Extract Ferment Filtrate?
Lactobacillus/Licorice Root Extract Ferment Filtrate is a liquid derived from fermenting licorice root extract with the probiotic bacterium Lactobacillus. The process breaks down larger licorice molecules into smaller, more skin friendly compounds while also enriching the liquid with peptides, amino acids and beneficial sugars produced during fermentation. Licorice root itself contains glabridin and liquiritin, known for helping even out skin tone. Once fermented, these actives become more bioavailable and gentler.
Interest in fermented plant ingredients grew out of Korean beauty research in the early 2000s, where scientists noticed that fermentation could boost potency and reduce irritation. Skincare brands quickly adopted the concept and Lactobacillus/Licorice Root Extract Ferment Filtrate began appearing in brightening essences, soothing toners and lightweight moisturizers aimed at sensitive skin.
To make it, licorice roots are cleaned, ground and extracted in water or a mild solvent. The extract is then inoculated with a selected strain of Lactobacillus and left to ferment under controlled temperature and pH. After several days the mixture is filtered to remove solids and bacteria, yielding a clear or slightly amber filtrate that is ready for cosmetic use.
You will often find this ingredient in hydrating serums, calming sheet masks, anti-aging creams, spot treatments targeting dullness and after-sun gels that aim to reduce redness.
Lactobacillus/Licorice Root Extract Ferment Filtrate’s Cosmetic Benefits/Uses
The main role of this fermented filtrate in skincare is skin conditioning. It helps maintain a healthy appearance by softening the surface, supporting the moisture barrier and delivering a gentle brightening effect. Its fermented nature allows for better penetration, so formulas feel lightweight yet nourishing, making the skin look smoother, calmer and more even toned.
Who Can Use Lactobacillus/Licorice Root Extract Ferment Filtrate
This fermented licorice filtrate is generally well tolerated by all skin types including dry, oily, combination and sensitive skin because it is mild and water based. People with very reactive skin often appreciate the soothing properties that come from both licorice and the fermentation process. Those with known allergies to soy or other fermented botanicals should double check the full ingredient list as formulas sometimes combine multiple ferments that could pose a problem.
Because the material is derived from a plant extract and a non animal bacterial culture it is considered suitable for both vegetarians and vegans. No animal derived substrates are typically used in the fermentation stage though strict vegans may still wish to confirm that the finished product has not been tested on animals.
Current research shows no specific concerns for topical use during pregnancy or breastfeeding, however this is not medical advice and pregnant or nursing individuals should run any new skincare product past their doctor just to be on the safe side.
The filtrate does not make skin more sensitive to sunlight so it is not known to cause photosensitivity. Daily sunscreen is still recommended with any brightening routine for overall skin health. The ingredient also plays nicely with common actives like niacinamide, hyaluronic acid and ceramides, making it easy to slot into most routines.
Potential Side Effects/Adverse Reactions
Side effects and reactions to the topical application of Lactobacillus/Licorice Root Extract Ferment Filtrate can vary from person to person. The following list covers potential issues but they are uncommon when the ingredient is formulated and used correctly.
- Mild redness or stinging – usually short lived and linked to overuse or very compromised skin barriers
- Allergic contact dermatitis – rare allergy to licorice compounds or fermentation byproducts may lead to itching rash or swelling
- Breakouts in acne prone skin – although non comedogenic a sudden change in routine or other formula components can occasionally trigger purging or clogged pores
- Interaction with active prescriptions – if used alongside topical steroids or medicated treatments the soothing effect can mask irritation making it harder to notice overuse of stronger drugs
- Microbial contamination risk – poorly preserved DIY products containing the filtrate could harbor unwanted bacteria leading to infection or irritation
If any of these reactions occur stop use immediately and consult a qualified healthcare professional or dermatologist for guidance.
Comedogenic Rating
Rating: 0/5. Lactobacillus/Licorice Root Extract Ferment Filtrate is water based, light in texture and contains no heavy oils or waxes that could clog pores. The molecules produced during fermentation are small and tend to absorb quickly so they do not sit on the surface where blockages start.
Because of this low rating it is generally considered suitable for people prone to acne or breakouts. The only caveat is that the overall formula matters; if the product pairs the filtrate with rich butters or occlusive silicones the finished item could still feel heavy on very oily skin.
Manufacturers usually add the filtrate at modest levels so it rarely changes the feel or thickness of a product. Its presence in a formula is therefore a low risk factor for congestion.
Summary
Lactobacillus/Licorice Root Extract Ferment Filtrate conditions skin by softening the surface, supporting moisture balance, calming redness and giving a mild brightening boost. Fermentation breaks down licorice compounds into smaller parts and adds skin friendly peptides and sugars, making the extract easier for skin to use and gentler than raw licorice.
First championed by Korean beauty brands, the ingredient is gaining steady popularity worldwide but is still more of a specialty add-on than a staple like hyaluronic acid. You will mostly see it in serums, essences and masks aimed at sensitive or dull skin.
Topical use is regarded as safe for most people with only rare reports of irritation or allergy. As with any new product it is wise to patch test to confirm personal tolerance and enjoy the benefits with confidence.